如何在输入文本中按键时禁用(只读)其他输入文本

<input type="text" id="input1">
<input type="text" id="input2" disabled>
<input type="text" id="input3" disabled>

<input type="text" id="input1" onkeydown="disableInputs(event)">
<input type="text" id="input2">
<input type="text" id="input3">

<script>
function disableInputs(event) {
  event.preventDefault(); // 阻止默认行为
  document.getElementById("input2").disabled = true;
  document.getElementById("input3").disabled = true;
}
</script>

<style>
.readonly {
  pointer-events: none;
  background-color: #f2f2f2;
}
</style>

<input type="text" id="input1">
<input type="text" id="input2" class="readonly">
<input type="text" id="input3" class="readonly">